FL-12. Midrib placement: 0 = centric; 1 = excentric (wider side of blade 1.3 times or more as wide as the narrower side).

FL-13. Midrib development (abaxial surface): 0 = visible (distinct) for the full length (or nearly so) of the blade; 1 = visible (distinct) only in the basal one-third or so if the blade; 2 = not distinguishable from the primary veins in the leaf blade.